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Then, make an "insert into table3" followed by your select criterias wich must look first for the union of the two tables without then the intersect of the two tables.
example: INSERT INTO TABLE3 SELECT * FROM TABLE1 UNION SELECT * FROM TABLE2 MINUS (SELECT * FROM TABLE1 INTERSECT SELECT * FROM TABLE2);
table1 = [abcd] table2=[defg]union = [abcdefg]intersect = [d]union MINUS intersect = [abcefg] => table3
Hope this will help you...!!